将事件处理程序添加到动态创建的复选框（aspx，c＃）

Question

So my problem is that I want to add an event handler to a dynamically created CheckBox. I have already looked at other ways to do this, and decided that creating a dynamic table which contains my CheckBoxes is the best option for me. I have not added these CheckBoxes to the Control Tree because I need to manage the ViewState manually. Either way, my code works in every way except that my CheckBox's CheckChanged Event does not fire. I am adding this eventhandler to my CheckBox in my pageLoad event, however, any page event I try seems to give me the same results:

CheckBox chbxLv1 = new CheckBox();
chbxLv1.ID = "DymanicallyCreatedIDForIdentification";
chbxLv1.AutoPostBack = true;
chbxLv1.CheckedChanged += new EventHandler(this.checkChanged);

/* Way lower in my code */

protected void checkChanged(object sender, EventArgs e)
{
//Some code goes here which never seems to execute... grrr
}

I thought that this may be a problem with the ViewState at first and did quite a bit of research on that. I'm now thinking I am doing something dumb with adding an event handler. I'm not sure why this event never fires, but I'm a little new at adding events to a control. Do I need a delegate here?

--Roman

Answer 1

为了在ASP.NET页面生命周期中正确处理动态加载的控件，需要在OnInit期间（或实际上在LoadViewState之前）将它们添加到页面中，否则它们的状态信息将不会得到维护，实际上，您可以，则视视图状态而定，具体取决于页面控制图中添加内容的方式/位置。